Kazumasa Ishikawa

Kazumasa Ishikawa (1534-1609) was a milk brother of Ieyasu Tokugawa, as he was a hostage alongside him during the 1550s under the Imagawa. In 1585 he left Ieyasu Tokugawa, having served with him in the 1584 defeat in the Battle of Komaki-Nagakute, as he found Ieyasu foolhardy. He later retired.